watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor2:4539] Modules linked in: irq event stamp: 9882678 hardirqs last enabled at (9882677): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (9882677): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (9882677): [] read_seqbegin include/linux/seqlock.h:433 [inline] hardirqs last enabled at (9882677): [] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] hardirqs last enabled at (9882677): [] d_walk+0x80f/0xc80 fs/dcache.c:1248 hardirqs last disabled at (9882678): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (1837934): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311 softirqs last disabled at (1837851): [] invoke_softirq kernel/softirq.c:365 [inline] softirqs last disabled at (1837851): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405 CPU: 0 PID: 4539 Comm: syz-executor2 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_disable arch/x86/include/asm/paravirt.h:788 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:801 [inline] RIP: 0010:lock_release+0x126/0xa10 kernel/locking/lockdep.c:3935 RSP: 0018:ffff8801a28778a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff1003450ef19 RCX: ffffed003450ef62 RDX: 1ffffffff11a316e RSI: 0000000000000001 RDI: ffffffff88d18b70 RBP: ffff8801a28779d0 R08: 0000000000000000 R09: ffffed0039366320 R10: ffffed0039366320 R11: ffff8801c9b31903 R12: ffff8801a28779a8 R13: ffff8801c9b31918 R14: ffff8801c9b31900 R15: ffff8801a286c4c0 FS: 000000000227d940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002286978 CR3: 00000001a280a000 CR4: 00000000001406f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000020000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock+0x1a/0x30 kernel/locking/spinlock.c:176 spin_unlock include/linux/spinlock.h:350 [inline] d_walk+0x451/0xc80 fs/dcache.c:1298 shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 vfs_rmdir+0x202/0x470 fs/namei.c:3850 do_rmdir+0x523/0x610 fs/namei.c:3911 __do_sys_rmdir fs/namei.c:3929 [inline] __se_sys_rmdir fs/namei.c:3927 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455777 RSP: 002b:00007fffc0855e48 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fffc0857bf0 RDI: 00007fffc0857bf0 RBP: 00007fffc0857bf0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 000000000227e940 R13: 0000000000000000 R14: 00000000000003e0 R15: 000000000002d907 Code: 00 9c 58 0f 1f 44 00 00 48 c7 c7 70 8b d1 88 48 89 85 e8 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 48 07 00 00 48 83 3d 0c 88 74 07 00 0f 84 47 06 00 00 fa Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4540 Comm: syz-executor0 Not tainted 4.17.0-rc4+ #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x35a/0x5140 kernel/locking/lockdep.c:3344 RSP: 0018:ffff8801a263f530 EFLAGS: 00000002 RAX: 0000000000000003 RBX: 00000000000000b9 RCX: ffffffff815c9ec1 RDX: 0000000000000001 RSI: ffff8801a2636d38 RDI: ffffffff8a23eaf8 RBP: ffff8801a263f8c0 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000000078 R11: ffff8801a2636500 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000002 R15: ffffffff88c12648 FS: 000000000213f940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002148978 CR3: 00000001a24d9000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] read_seqbegin include/linux/seqlock.h:433 [inline] read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] d_walk+0x1c0/0xc80 fs/dcache.c:1248 shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 vfs_rmdir+0x202/0x470 fs/namei.c:3850 do_rmdir+0x523/0x610 fs/namei.c:3911 __do_sys_rmdir fs/namei.c:3929 [inline] __se_sys_rmdir fs/namei.c:3927 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455777 RSP: 002b:00007fffc10c1d18 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 RDX: 0000000000000000 RSI: 00007fffc10c3ac0 RDI: 00007fffc10c3ac0 RBP: 00007fffc10c3ac0 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000206 R12: 0000000002140940 R13: 0000000000000000 R14: 00000000000003b0 R15: 000000000002d903 Code: 40 f8 22 8a 44 89 c8 49 8d b3 38 08 00 00 48 c1 fb 04 4c 8d 14 80 48 89 b4 24 90 00 00 00 69 db 3d cf f3 3c 49 c1 e2 03 83 c3 01 <45> 85 c9 74 44 48 b9 00 00 00 00 00 fc ff df 4a 8d 44 16 d8 48